James Lind LibraryIllustrating the development of fair tests of treatments in health care

Bell JA (1948)

The epidemiological principles and procedures involved in a study of the prophylactic value of an alum-precipated mixture of diphtheria toxoid and pertussis vaccine. Thesis submitted to the School of Hygiene and Public Health of the Johns Hopkins University in conformity with the requirements for the Degree of Doctor of Public Health.